KB-501SG Online Gas Detector employs advanced Catalytic Combustion or Electrochemical sensor and microcontroller, and SMD technology.

KB-501SG can translate the target gas concentration signals into digital signals for display. Three-wire system 4~20mA electric current signals output, with long-distance transmission and good anti-interference capacity. In addition, it has two-stage alarm function with acoustic and visual signals.

Features
1. Cast aluminium housing
2. Advanced Catalytic Combustion or Electrochemical sensor
3. Intrinsically safety design
4. High brightness LED digital display
5. Timely alert with sound and light alarm signals
6. Three-wire system 4~20mA standard signals output and long distance transmission
7. Possible to connect to DCS system directly
8. The sensor has high sensitivity, quick-response capacity, long working life and short polarization time
9. With a manual controller (optional units) used for adjustment of parameter
10. Function of infrared remote control operation (remote-control is optional units)

Technical Specifications of KB-501SG Combustible/Toxic/O2 Gas detector 
Detectable Gas 1. Combustible/Flammable/Explosive gas
Detecting Range 0~100% LEL
Alarm Threshold Low: 25% LEL / High: 50% LEL
Detectable Gas 2. Oxygen (O2)
Detecting Range 0~30VOL%
Alarm Threshold (Two-stage) Low: 18.5% VOL  High: 23.5% VOL
Detectable Gas 3. Toxic/Poisonous/Hazardous gas (CO, H2S, etc.)
Detecting Range Refer to the gas parameter list
Alarm Threshold Refer to the gas parameter list
Sensor Type Catalytic Combustion sensor(Combustible gas);  Electrochemical sensor(Toxic and Oxygen)
Working Environment Temperature: -20~55°C; Humidity: ≤95% RH (non-condensing)"
Working Voltage 16~30V DC
Working Current ≤170mA(Combustible gas);  ≤50mA(Toxic and Oxygen)
Power Consumption <3W(Combustible gas);  <1 W(Toxic and Oxygen)
Display High brightness LED digital display
Output Signals  Three-wire system 4~20mA standard signals output
Alarm Output Two-way electrical relay tip output (30V 2A)
Alarm Signal Acoustic and light signals alert
Installation Means Wall mounted
Transmission Distance ≤1000m
Explosion-proof Type Explosion insulating
Explosion-proof Index Ex d IIC T6
Protection Grade IP65
Remarks: The detecting range and alarm threshold value can be adjusted according to customer's request.